System is a 4 ton 2 zone on 1750 sqft. unit is too big for house. Currently there are no mechanical issues. Evap cool and drain pan are extremely dirty. Blower is also very dirty, outdoor coil is very clogged giving in accurate pressure readings. Filter has not been changed in a very long time (no date on it but by condition of it looks to be over a yr) Cleared drain line, but coil drain pan needs a cleaning! Subpar flood protection. Recommend ugrade.